Electromagnetic winding.



C. T. HENDERSON.

ELECTROMAGNETIC WINDING. APPLICATION HLED mu 6. Min.

Pafented Sept. 4, 1917.

UNITED STATES PATENT OFFICE.

CLARK '1. HENDERSON, OF MILWAUKEE, WISCONSIN, ASSIGNOB TO THE CUTLER-W'EB MFG. 00., O! HILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ELECTROMAGNETIC WINDING.

flpccifloation of Letters Patent.

Patented Sept. 4, 1917.

Application filed July 6, 1914. Serial No. 849,801.

To all whom it may concern:

Be it known that I, CLARK T. HnmmnsoN, a citizen of the United States,residing at Milwaukee in the county of Milwaukee and State of isconsin,have invented new and useful Improvements in Electromagnetic Windings,ofwhich the following is a full, clear, concise, and exact description,reference being had to the accompan 'ng draw same and eliminate airpockets therein.

However, where the magnet is wound as afdresaid, it has been proven verydificult, if not impossible, to efi'ect thorough impregnation, due tothe fact that the insulation completely prevents ingress of theimpregnating material radially of the windmg, and furthermore, oftenlaps over the ends of the winding to prevent axial ingress of theimpregnating material.

This invention has among itsobjects to provide a winding of theaforesaid character which may be readily and thoroughly imp ated.

Various other objects and advantages of the invention will hereinafterappear.

For the purpose of more fully and clearly disclosing the nature andcharacteristic fee tures of the invention, one embodiment thereof hasbeen illustrated in the accompanying drawing, in which,

Figure 1 is a perspective view of a magnet winding, partially insection; and,

Fig. 2 is an enlarged perspective vie of a portion of one of the sheetsof insula ion emlployed in said winding.

eferring to Fig. 1, the same shows a magnet winding formed of aninsulated conductor 1 wound helically in a plurality of layers withsheets 2 of insulation inte osed between the layers. The insulation,

ever, is, as best illustrated in Fig. 2, provided with perforations 3 ofany preferred size and arrangement.

As will be understood the winding is formed by coiling the conductor 1about a suitable core and inserting the sheets 2 of insulation duringthe winding process.

Also, for purposes well understood, the insulation employed ispreferably of suflicient width to provide projecting marginal portions 4at opposite ends of the winding and it is such marginal portions thathave added to the difliculties of impregnation as above set forth. Thepressure of the impregnating material against the winding has causedsaid marginal portions of the insulation to fold over, as indicated bydotted lines, thus tending to seal the winding further impregnation.

However, when the winding is constructed as above described, the sameenables ingress of the impregnating material radially of the windingthrough the Berforations 3 in the sheets of insulation. f course, the

conductor in passing over the perforations tends to obstruct the samebut said perforations may be readily so proportioned and arranged as toinsure passages through each sheet of insulation at an adequate numberof points. In practice it is desired to provide a minimum number ofperforations and to provide perforations of minimum dimensions topreserve the usefulness of the insulation sheets.

A common method of impregnation consists in placing the winding to beimprege nated in an air tight receptacle, then evacuating saidreceptacle, pregnating material into said receptacle under a relativelyhigh pressure. Thus, where the winding is penetrable both axially andradially as above described, it will be apparent that the same maythoroughly lmpregnated even though ingress of the impregnating materialbe re sisted at the ends of the winding, as aforesaid.

What I claim as new and desire to securethp'Letters' Patent is:

An electromagnetic win ing comprising a conductor wound helica y inlayers and and then forcing nnbe readily and fierforate sheets ofinsulationinterpoaed bescribed my name in the; presence of two wittweenadjacent leyera thereof, the perforanesses. tions of said sheets ofinsulation being erran ed to rovide passe es radially through CLARKHENDERSON 5 sai win g to fee tate impregnation Witnesses:

thereof. TERI-A BAs'r, In witness whereof, I have hereunto sub- L. A.Wuson.

